Device for securing cutters or other articles jo rotary shafts



(No Model.)

W. n. OBOUTT. DEVICE FOR SECURING UUTTERS OR OTHER ARTICLES TO ROTARY SHAPTS. 4

110,530,285. Patented Dec. 4, 1894.

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b wc tm YWESTATES L TENT WILLIAM D. OROUTT, oFMELRosE, MASSACHUSETTS.

Dl-IYICE FOR SECURING (IUITTERS 0 OTHER ARTICLESTQ ROTARY SHAFTS.

srrrc rrrcarron fermingpart or retr at 530,285, dated December 4,1394. A 1 Applicationfiled J'i11y26,1894.: SerialNo.h18.676. momma.) 2 t To all whom it m ay' concern.-

Be it known that 1, WILLIAM D. ORCUITT, of

Melrose, in the county of lvliddlesexand State of Massachusetts, have invented certain new and useful Improvements in Devices for Securing Cutters or. other Articles to Rotary Shafts, of which the following, taken in connection with the accompanying drawings, is a specification. A

In some kinds of machines such for instance as machines for trimming and finishing the edges of boot and shoe soles and heels .the cutter or operating tool has to be very often removed from its shaft and replaced by another of a different size or pattern,and

hence it is Very desirable that it should be so secured to said shaft that it maybequickly and easily removed therefrom and another substituted therefor. Heretofore the most common way of securing such toolsto their shafts, known to me has been to fit thebore ofsaid tool as accurately as possible to the end of the shaft with its inner end bearing against a shoulder on said shaft, but the fit on said shaft must begsufficiently free to permit said tool to be readily slipped on and off without using a hammer for thepurpose, said tool then being clamped in positionby being pressed against said shoulder on its shaft by means of ascrew screwed into the end of said shaft in axial line therewith-with its head bearing upon a collar having a diameter greater than the end of said shaft and bearing at its outer edge upon the outer end face of the tool.

It has been found in practice that it is next to impossible to bore out a series of cutters or other tools to a perfectly uniform size and fit them to a single shaft so that they may be easily placed thereon and removed therefrom and all be sufficiently tight thereon as to prevent anypossibility of lateral play thereon. It has also been found that the necessary wear of the shaftand the holes through the hubs of said tools occasioned by repeated applications and removals of said tools materially increases the liability of the tool being thrownout of axial line with said shaft thus causing it to run untrue.

The object of my invention is to remedythe above mentioned objections and provide means for securing such tools to their shafts looking at the outer face of the cutter.

bly larger than the diameter of that part of the shaft upon which it is mounted when said shaft is in its normalcondition, and it consists in certain novel features of construe tion, arrangement and combination of parts which will be readily understood by reference to the description of the accompanying draw- .ings and to the claims hereto appended and r in which my invention is clearly pointed out.

Figure l of the drawings is a sectional elevation of a shaft with a sole edge trimming cutter secured thereto according to my invention. Fig. 2 is an end elevation of the same- Figs. 3 and 4 are respectively an end view and a longitudinal section of the expansible bushing to be screwed i-ntothe end of the shaft and which forms thebearing for the ,cutter. Figs. 5 and 6 are respectively anend view and a side elevation of the central mandrel, and

Fig. 7 is a sectional elevation of a shaft in which the expansible bushing is formed integral with the shaft.

In the drawings A is the shaft of a sole or heel trimming machine which may be tubular throughout it'sentire lengthas shown in Fig. 7-or for a portion of its length as shown in Fig. 1. A l i B is the tool receiving bushing having an exterior diameter less than that of the main body of the shaft A and provided at the outer "end of its inner perimeter with a frusto-conical surface a, and with a series of radial slits b 12 extending longitudinally thereof as shown in Figs. 1, '3, and 4: and may be formed into-.

gral with the shaft as shown in Fig.7, though I prefer in most cases to make it in a separate piece from the shaft and form thereon the shoulders c and d and the exteriorly threaded extension B, which screws into the shaft A until the shoulder a is slightly inside of the plane of the end of said shaft A, as shown in Fig. 1.

C is a sole edge trimming cutter having a hub e, which is bored out to fit the bushing B, so as to be easily applied thereto or removed therefrom, the inner end of said. hub

when placed on said bushing bearing against the end of said shaft A as shown. The length of the bushing B from the shoulder c to its outer end is somewhat less than the length of the hub of the cutter O.

D is the rand guide and guard having a thin circular projection or hub on its inner surface which fits in the bore of the cutter hub without coming incontact with the end of the bushing 13.

E is a mandrel fitted to the bore of the shaft A and the bushing B and having formed on its outer end a frusto-conical surface g to engage the similar surface in the interior of the bushing B to expand said bushing and force its sections into firm contact with the inner surface of the bore of the cutter hub.

The outer end of the mandrel E has formed therein a threaded hole to receive the clamping screw it the head of which bears upon the outer surface of the rand guide D to clamp the cutter between said rand guide and the end of the shaft A at the same time that it draws the conical surface on said mandrel into the corresponding surface in said bushing to expand said mandrel.

The inner end of the threaded extension B of the bushing B has formed therein the slots i with which the pin j set transversely through the mandrel E engages to prevent said mandrel revolving about its axis when the screw h is being turned in or out. p

In the case illustrated in Fig. 7, when the bushing 13 is integral with the shaft A the mandrel has its inner end slotted as shown and the pin is inserted through the shaft A after the mandrel is placed in position and serves to prevent said mandrel being revolved and also from being slipped backward into the bore of the shaft so far as to prevent engagement of the screw it with the threaded hole in said mandrel.

The operation of my invention will be readily understood from the foregoing without further explanation here.

The advantage of this construction and arrangement of parts is that by the expansion of the bushing caused by drawing the frustoconical end of the mandrel into the correspondingly tapered bore of said bushing the toolwill always be brought into perfect axial line with the shaft even when there is a very perceptible difierence between the diameters of the bushing and the bore of the hub of the tool, and the tool will be held with greater firmness.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. In combination with a rotary cutter or other tool, a shaft having its tool carrying end made tubular; a tubular bushing or bearing at one end of said shaft to receive said tool and having a frusto conical surface formed in its inner perimeter and provided with a plurality of longitudinal slits extending inward from its outer end; a mandrel fitted to and movable endwise within the bore of said shaft and bushing and connected to said shaft or bushing so as to be revoluble therewith and having formed upon its outer end a frustoconical surface to engage the similar surface within said bushing to expand the same; a collar to bear against the outer'end face of said tool; and a clamping bolt passing through said collar and screwed into said mandrel.

2. The combination of the shaft A having a central bore extending from its tool bearing end toward its opposite end and provided with a female thread therein; the bushing B provided with the shoulder d and the threaded extension Band having a frusto conical surface at the outer end of its inner perimeter, and a plurality of longitudinal slits extending from its outer end inward, and the slots 11 formed in its inner end; the mandrel E provided with the frusto-conical surface 9 and the radially projecting pin; a cutter or other rotary tool titted to said bushing to bear against the end of said shaft; a collar to bear against the outer face of said tool; and the bolt 72. all constructed arranged and operating substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 23d day of July, A. D. 1894:.

WILLIAM D. OROUTT.

Witnesses:

N. C. LOMBARD, H. THEODORE FLETCHER. 

